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Get segment fault when I tried to drawPixels to GL_RGBA , please help!

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I can draw pixels to RED, GREEN, BLUE and ALPHA partion by using: GLubye buf[512][512]; glDrawBuffer(GL_FRONT); glDrawPixels(512,512,GL_RED, GL_UNSIGNED_BYTE, buf) But I encounter a segment fault when I tried to draw pixel to RGBA partion. The following is what my code look like: GLuint buf[512][512]; glDrawBuffer(GL_FRONT); glDrawPixels(512,512,GL_RGBA, GL_UNSIGNED_INT, buf) What could be wrong here? Please help! Thanks a lot

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